Observations FWIW. When I moved to my property, I. pseudacorus had
overrun a neglected flower bed; one that was not a wet or moist soil
situation at all. In fact, the area was hardish clay loam prone to
considerable dryness and adjacent to a large maple tree to boot. It had
seeded itself about the margins of the mass as well as spread
vegetatively. So it can persist outside of wet situations. Interestingly
I found no seedlings anywhere more than a few feet from the stand.
Fortunate since a marshy creek lies only a hundred feet away. Perhaps
critters and birds don't care to ingest the seeds? But I guess other
dispersal mechanisms are possible. It seems easy to control using
glyphosate and extra surfactant. Ungerminated seeds are not controlled
this way of course. There are formulations of glyphosate approved for
use in wetland situations if one is going about that to any significant
scale.
To challenge the stuff, one spring I took some shovel width chunks of it
and literally placed them on bare ground that gets afternoon sun. They
rooted in and though not quite prolific, they still managed to be in the
running in a two year test of zero care or watering. They met up with
glyphosate in the end. Le coup de grÃce pour le fleur de lys. :)
Shaub Dunkley, Zone 6b NC
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